Well maybe its unwanted by you, but it might be wanted by someone else.
I have no problem with anything having its space as long as its legal.
I never saw a NSFW post on lemmy actually, I have NSFW content hidden by default and it works great. Even though I am not interested in that content, I can respect that some people are.
This is also why I think banning communities because someone felt slightly offended is not the way to go. Lemmy already has a good way of moderating content per user, and you can ban communities and never see their content. I dont think instance admins should be removing anything other than illegal content.